EPROM emulator

[Mike Pitts]

I'm not 100% sure of what the question is asking.  The 
memory map of the 64k EPROM?  Or memory map of the emulator?

The memory map of my EPROM is 

$1800-$????: GM External Equipment Interface Code
$4000-$71FF: Data tables
$7200-$FFFF: Micro Code

If "roll-in" means copying the EPROM data into RAM, it 
does not do this.  Parts of this EPROM are not used 
because RAM and on-chip area map on top of it.

For example: Registers are based at $3000.  RAM is 
$0000-$08FF.  EEPROM is $0E00-$0FFF.  There's still 
no way to emulate the entire table and code area with 
a 32k part.  It would be possible to emulate only the 
upperhalf ($0000-$7FFF), this would at least give the 
capability of altering tables.  But the lower half 
would obviously need to be present via some kind of 
mechanism.

I actually built an adapter for my intronics emulator 
to let me do this, using the high address line as a 
chip select. But for whatever reason, this didn't work. 
That's why I resorted to using the internal EEPROM.

-Mike

-----Original Message-----
| >>I assume that means that none of the P4's used EPROM's larger that 32K?
| 
| My P4 uses a 64k byte EPROM (27C512).  Thats the reason I 
| can't use my Intronics emulator, it only goes to 32k byte.
| 
Anyone know the memory map organization of these? Do they roll part of 
the EPROM in and out, or maybe just not use it all.